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cond-mat.str-el2014
The existence of a quantum phase transition in a Hubbard model on a square lattice
Valentin Voroshilov
A novel canonical transformation is offered as the mean for studying properties of a system of strongly correlated electrons. As an example of the utility of the transformation, it…
cond-mat.str-el2013
The existence of a quantum phase transition in a Hubbard model on a quasi-one-dimentional two-leg ladder
Valentin Voroshilov
A canonical transformation of a new type is offered as the mean for studying properties of a system of strongly correlated electrons. As an example of the utility of the transforma…
cond-mat.str-el2009
On the existence of Cooper pairs in the Hubbard Model
Valentin Voroshilov
By means of a new canonical transformation for the one-band Hubbard model at half filling we show the existence of Cooper pairs formed by strongly interacting quasiparticles.